If you are running Lync Server 2010 and have previously used OCS, you may realize how hard it is to find the versions of Lync that your clients are running. It was very easy to do with OCS.
Stephen Olsen has written a fantastic tool that will show you the version each client is running along with a bunch of other useful information.
To find out more about this tool, visit his website http://www.stumper66.com/software/lync.html. Also download a copy of the tool from me – http://blog.danovich.com.au/wp-content/uploads/2011/02/FindLyncVersions.zip.